What is the value of the discriminant for the quadratic equation 2x2− x + 8 = 0?

Mathematics

1 answer:

Alja [10]3 years ago

7 0

2x² - x + 8 = 0
Discriminant = b² - 4ac
a=2, b=-1, c=8

D = (-1)² - 4 * 2 * 8 = 1 - 64 = -63

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Step-by-step explanation:

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Step-by-step explanation:

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Step-by-step explanation:

$4^x+6\cdot 2^x+8=0\\\\2\cdot 2^x+6\cdot 2^x+8=0\\\\\text{Let u = }2^x\\2u+6u+8=0\\8u+8=0\\8u=-8\\u=-1\\\\\text{Substitute u with }2^x\\2^x=-1\\\text{not possible}$